1 ;;; prolog.el --- major mode for editing and running Prolog under Emacs
3 ;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
5 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 ;; This package provides a major mode for editing Prolog. It knows
28 ;; about Prolog syntax and comments, and can send regions to an inferior
29 ;; Prolog interpreter process.
33 (defvar prolog-mode-syntax-table nil)
34 (defvar prolog-mode-abbrev-table nil)
35 (defvar prolog-mode-map nil)
38 "Major mode for editing and running Prolog under Emacs"
42 (defcustom prolog-program-name "prolog"
43 "*Program name for invoking an inferior Prolog with `run-prolog'."
47 (defcustom prolog-consult-string "reconsult(user).\n"
48 "*(Re)Consult mode (for C-Prolog and Quintus Prolog). "
52 (defcustom prolog-compile-string "compile(user).\n"
53 "*Compile mode (for Quintus Prolog)."
57 (defcustom prolog-eof-string "end_of_file.\n"
58 "*String that represents end of file for prolog.
59 nil means send actual operating system end of file."
63 (defcustom prolog-indent-width 4
64 "Level of indentation in Prolog buffers."
68 (if prolog-mode-syntax-table
70 (let ((table (make-syntax-table)))
71 (modify-syntax-entry ?_ "w" table)
72 (modify-syntax-entry ?\\ "\\" table)
73 (modify-syntax-entry ?/ "." table)
74 (modify-syntax-entry ?* "." table)
75 (modify-syntax-entry ?+ "." table)
76 (modify-syntax-entry ?- "." table)
77 (modify-syntax-entry ?= "." table)
78 (modify-syntax-entry ?% "<" table)
79 (modify-syntax-entry ?\n ">" table)
80 (modify-syntax-entry ?< "." table)
81 (modify-syntax-entry ?> "." table)
82 (modify-syntax-entry ?\' "\"" table)
83 (setq prolog-mode-syntax-table table)))
85 (define-abbrev-table 'prolog-mode-abbrev-table ())
87 (defun prolog-mode-variables ()
88 (set-syntax-table prolog-mode-syntax-table)
89 (setq local-abbrev-table prolog-mode-abbrev-table)
90 (make-local-variable 'paragraph-start)
91 (setq paragraph-start (concat "%%\\|$\\|" page-delimiter)) ;'%%..'
92 (make-local-variable 'paragraph-separate)
93 (setq paragraph-separate paragraph-start)
94 (make-local-variable 'paragraph-ignore-fill-prefix)
95 (setq paragraph-ignore-fill-prefix t)
96 (make-local-variable 'indent-line-function)
97 (setq indent-line-function 'prolog-indent-line)
98 (make-local-variable 'comment-start)
99 (setq comment-start "%")
100 (make-local-variable 'comment-start-skip)
101 (setq comment-start-skip "%+ *")
102 (make-local-variable 'comment-column)
103 (setq comment-column 48)
104 (make-local-variable 'comment-indent-function)
105 (setq comment-indent-function 'prolog-comment-indent))
107 (defun prolog-mode-commands (map)
108 (define-key map "\t" 'prolog-indent-line)
109 (define-key map "\e\C-x" 'prolog-consult-region))
113 (setq prolog-mode-map (make-sparse-keymap))
114 (prolog-mode-commands prolog-mode-map))
117 (defun prolog-mode ()
118 "Major mode for editing Prolog code for Prologs.
119 Blank lines and `%%...' separate paragraphs. `%'s start comments.
122 Entry to this mode calls the value of `prolog-mode-hook'
123 if that value is non-nil."
125 (kill-all-local-variables)
126 (use-local-map prolog-mode-map)
127 (setq major-mode 'prolog-mode)
128 (setq mode-name "Prolog")
129 (prolog-mode-variables)
130 (run-hooks 'prolog-mode-hook))
132 (defun prolog-indent-line (&optional whole-exp)
133 "Indent current line as Prolog code.
134 With argument, indent any additional lines of the same clause
135 rigidly along with this one (not yet)."
137 (let ((indent (prolog-indent-level))
138 (pos (- (point-max) (point))) beg)
141 (skip-chars-forward " \t")
142 (if (zerop (- indent (current-column)))
144 (delete-region beg (point))
146 (if (> (- (point-max) pos) (point))
147 (goto-char (- (point-max) pos)))
150 (defun prolog-indent-level ()
151 "Compute prolog indentation level."
154 (skip-chars-forward " \t")
156 ((looking-at "%%%") 0) ;Large comment starts
157 ((looking-at "%[^%]") comment-column) ;Small comment starts
158 ((bobp) 0) ;Beginning of buffer
160 (let ((empty t) ind more less)
162 (setq less t) ;Find close
164 ;; See previous indentation
170 (skip-chars-forward " \t")
171 (if (not (or (looking-at "%[^%]") (looking-at "\n")))
174 (setq ind 0) ;Beginning of buffer
175 (setq ind (current-column))) ;Beginning of clause
177 (if (looking-at "%%[^%]")
181 (setq more t) ;Find open
184 (end-of-prolog-clause)
185 (or (bobp) (forward-char -1))
186 (cond ((looking-at "[,(;>]")
187 (if (and more (looking-at "[^,]"))
188 (+ ind prolog-indent-width) ;More indentation
189 (max tab-width ind))) ;Same indentation
190 ((looking-at "-") tab-width) ;TAB
191 ((or less (looking-at "[^.]"))
192 (max (- ind prolog-indent-width) 0)) ;Less indentation
193 (t 0)) ;No indentation
197 (defun end-of-prolog-clause ()
198 "Go to end of clause in this line."
199 (beginning-of-line 1)
200 (let* ((eolpos (save-excursion (end-of-line) (point))))
201 (if (re-search-forward comment-start-skip eolpos 'move)
202 (goto-char (match-beginning 0)))
203 (skip-chars-backward " \t")))
205 (defun prolog-comment-indent ()
206 "Compute prolog comment indentation."
207 (cond ((looking-at "%%%") 0)
208 ((looking-at "%%") (prolog-indent-level))
211 (skip-chars-backward " \t")
212 ;; Insert one space at least, except at left margin.
213 (max (+ (current-column) (if (bolp) 0 1))
219 ;;; Inferior prolog mode
221 (defvar inferior-prolog-mode-map nil)
223 (defun inferior-prolog-mode ()
224 "Major mode for interacting with an inferior Prolog process.
226 The following commands are available:
227 \\{inferior-prolog-mode-map}
229 Entry to this mode calls the value of `prolog-mode-hook' with no arguments,
230 if that value is non-nil. Likewise with the value of `comint-mode-hook'.
231 `prolog-mode-hook' is called after `comint-mode-hook'.
233 You can send text to the inferior Prolog from other buffers
234 using the commands `send-region', `send-string' and \\[prolog-consult-region].
237 Tab indents for Prolog; with argument, shifts rest
238 of expression rigidly with the current line.
239 Paragraphs are separated only by blank lines and '%%'.
242 Return at end of buffer sends line as input.
243 Return not at end copies rest of line to end and sends it.
244 \\[comint-kill-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
245 \\[comint-interrupt-subjob] interrupts the shell or its current subjob if any.
246 \\[comint-stop-subjob] stops. \\[comint-quit-subjob] sends quit signal."
250 (setq major-mode 'inferior-prolog-mode
251 mode-name "Inferior Prolog"
252 comint-prompt-regexp "^| [ ?][- ] *")
253 (prolog-mode-variables)
254 (if inferior-prolog-mode-map nil
255 (setq inferior-prolog-mode-map (copy-keymap comint-mode-map))
256 (prolog-mode-commands inferior-prolog-mode-map))
257 (use-local-map inferior-prolog-mode-map)
258 (run-hooks 'prolog-mode-hook))
262 "Run an inferior Prolog process, input and output via buffer *prolog*."
265 (switch-to-buffer (make-comint "prolog" prolog-program-name))
266 (inferior-prolog-mode))
268 (defun prolog-consult-region (compile beg end)
269 "Send the region to the Prolog process made by \"M-x run-prolog\".
270 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
274 (send-string "prolog" prolog-compile-string)
275 (send-string "prolog" prolog-consult-string))
276 (send-region "prolog" beg end)
277 (send-string "prolog" "\n") ;May be unnecessary
278 (if prolog-eof-string
279 (send-string "prolog" prolog-eof-string)
280 (process-send-eof "prolog")))) ;Send eof to prolog process.
282 (defun prolog-consult-region-and-go (compile beg end)
283 "Send the region to the inferior Prolog, and switch to *prolog* buffer.
284 If COMPILE (prefix arg) is not nil, use compile mode rather than consult mode."
286 (prolog-consult-region compile beg end)
287 (switch-to-buffer "*prolog*"))
289 ;;; prolog.el ends here